Optical device, camera and line of sight detection device, relative position distinction manner of line of sight method of detection, and eye contacting part and eyeball position.

摘要

PURPOSE:To detect accurately a line of sight without providing the apparatus with a member such as a mercury switch. CONSTITUTION:At least two kinds of relationships on the relative position between the position of eyeballs of an observer and the position of eye contact part are estimated and detection on the line of sight is performed on each case by line of sight detecting means 100 and 101 and an indication selecting means 100 wherein an indication is selected from a plurality of indications is formed and detection of the line of sight is respectively performed on the position of the eyeballs of the observer and the relative position of the eye contact part which can be estimated in advance and from this line of sight detecting result and the positional relation among a plurality of indications arranged within an observation plane, an indication is selected from a plurality of indications.